Malicious PDF — malware analysis report

Static analysis result for SHA-256 f88b21f1dadc2071…

MALICIOUS

PDF

85.2 KB Created: 2021-09-19 10:58:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0b4b8a03a8e09a1597b5af457213151c SHA-1: 7ed31975d1b6efd55ffcaa7f25f46c9c07647798 SHA-256: f88b21f1dadc207162937229722376ef8b8cb9eb6041e9ea3783ff816eb0c242
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external domains, many of which are structured as link farms or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://pixomot.ru/uplcv?utm_term=best+android+emulator+app PDF link annotation
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/vexetejabawujove.pdfIn PDF document text
    • http://china-shengbang.com/upload_fck/file/2021-9-19/20210919121514112297.pdfIn PDF document text
    • https://xuanhongkhang.com/upload/files/sesis.pdfIn PDF document text
    • http://grandfiltr.com/files/file/11119463068.pdfIn PDF document text
    • http://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/4097648259.pdfIn PDF document text
    • http://cmtl.in/uploads/userfiles/file/file/75127985621.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/mesupunuposozenefe.pdfIn PDF document text
    • https://puntodeplacer.com/userfiles/file/butun.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/32209153351.pdfIn PDF document text
    • https://wsbtitan.com/images/file/rigufofu.pdfIn PDF document text
    • https://free-spirit-city.eu/uploads/wysiwyg/files/59915991314.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/69769990766.pdfIn PDF document text
    • http://motovelo-nmsk.ru/userfiles/file/30162626137.pdfIn PDF document text
    • http://kystar.net/filespath/files/20210908025727.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/11308230292.pdfIn PDF document text
    • http://vantaidongsaigon.com/uploads/files/begiremufazonomoke.pdfIn PDF document text
    • http://studiotecnicolari.it/userfiles/files/lazokosikukelenotumekeg.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/lepaaq9bobs8ssa6gccols0e05/53262363677.pdfIn PDF document text
    • http://eiffelflowersquesnel.com/userfiles/file/xibenow.pdfIn PDF document text
    • http://195exim.com/datas/files/55944008313.pdfIn PDF document text
    • http://corising.info/sa_upload/userfiles/file/20210913060518.pdfIn PDF document text
    • http://gpsputhuppally.com/userfiles/file/77262190467.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e75e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE75E 18056 bytes
SHA-256: f7fe038da7e4d74b650880f57334c3c4e9817cdd62d3960c38374dfff6e95d11
font_01_sfnt_off0001164a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1164A 10708 bytes
SHA-256: 3f0439bc719af09df82d253f41e8012176e923c76913a28b84564e1997cbdcce
font_02_sfnt_off00012ee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.